| Naomi Financial Limited | Financial services | 2022 |
| National Coal Board Limited | Other services | 2024 |
| Natural Pond Solutions Ltd | Manufacturing | 2020 |
| Natural Spring Water Ltd | Other services | 2022 |
| Nautilus Education Ltd | Information & communication | 2020 |
| NAVIG8 Advisory Limited | Professional & scientific | 2025 |
| NB Construction (Yorkshire) Limited | Construction | 2023 |
| NC Originals Limited | Arts & recreation | 2012 |
| NCW Planning & Development Ltd | Administrative & support | 2016 |
| ND Walker Transport Ltd | Transport & logistics | 2012 |
| Ndap Construction Limited | Construction | 2019 |
| Nest Interiors Yorkshire Ltd | Wholesale & retail | 2024 |
| Netherleigh Property Development Ltd | Construction | 2025 |
| Netro Technologies Ltd | Information & communication | 2026 |
| New Beech Management Company Ltd | Real estate | 2011 |
| New Bello Pizza Limited | Hospitality | 2021 |
| New Dawn Resources Limited | Professional & scientific | 2007 |
| New Energy Intergration Limited | Professional & scientific | 2022 |
| New Mill Cars Ltd | Transport & logistics | 2022 |
| New Oakham Ltd | Professional & scientific | 2011 |
| New Spice Fusion 1 Ltd | Hospitality | 2025 |
| Newfield Honley Limited | Professional & scientific | 2002 |
| Newgate North Limited | Real estate | 2025 |
| Newlam Ltd | Wholesale & retail | 2016 |
| Newton (Recycling) Ltd | Construction | 2025 |
| Nexenx Consultancy Limited | Professional & scientific | 2025 |
| NGR Consulting Ltd | Professional & scientific | 2025 |
| Nick Clague Consultancy Limited | Professional & scientific | 2024 |
| Niew Consulting Ltd | Professional & scientific | 2019 |
| Niew Properties Ltd | Households | 2022 |
| Njhr Associates Limited | Professional & scientific | 2016 |
| NL Windows Ltd | Administrative & support | 2017 |
| NO 25 (Holmfirth) Limited | Wholesale & retail | 2025 |
| Nook (Yorkshire) Ltd | Wholesale & retail | 2015 |
| Norcot Limited | Wholesale & retail | 1966 |
| Norridge Bottom Ltd | Manufacturing | 2017 |
| North Light Pottery Ltd | Arts & recreation | 2021 |
| North Nest Homes Limited | Real estate | 2025 |
| North Yorkshire Polymers Limited | Manufacturing | 2001 |
| Northacre Property Group Ltd | Financial services | 2026 |
| Northacre Property Partners Ltd | Real estate | 2026 |
| Northern Dyers Limited | Manufacturing | 1988 |
| Northern Nest Relocations Ltd | Real estate | 2025 |
| Northern Pipework Services Limited | Construction | 2019 |
| Northern Quarter Events CIC | Arts & recreation | 2025 |
| Northern Security West Ltd | Administrative & support | 2015 |
| Northern Sole Cafe Limited | Hospitality | 2020 |
| Northern Star Mentoring Ltd | Professional & scientific | 2020 |
| Northpoint Hospitality Ltd | Hospitality | 2025 |
| Nourished & Active by Lorna Ltd | Health & social care | 2024 |
| Nova Builders Limited | Construction | 2007 |
| Nova Stone Investments Limited | Real estate | 2026 |
| Nova Stone Worktops Ltd | Construction | 2023 |
| Nowhere-Nowhere Ltd | Manufacturing | 2021 |
| NP International Limited | Information & communication | 2016 |
| NRB Tech Ltd | Other services | 2018 |
| NSN Trading Ltd | Wholesale & retail | 2017 |
| Nswuk Ltd | Extraterritorial | 2020 |
| NTP Access Equipment Limited | Construction | 2017 |
| NTP Access Limited | Construction | 2017 |
| NTP Capital Limited | Extraterritorial | 2021 |
| NTP Engineering Limited | Manufacturing | 2005 |
| NTP Group Ltd | Extraterritorial | 2021 |
| NTP Hoistaid Limited | Administrative & support | 2012 |
| NTP Hoists Limited | Wholesale & retail | 2017 |
| NTP Holdings Limited | Professional & scientific | 2016 |
| NTP Properties Limited | Extraterritorial | 2021 |
| Nuclear Precision Engineering Limited | Other services | 2023 |
| Nudelaserco Ltd | Other services | 2022 |
| Nuke Fitness Limited | Wholesale & retail | 2018 |
| Number 1 Digital Ltd. | Professional & scientific | 2019 |
| Nuncius Compliance Solutions Ltd | Administrative & support | 2018 |
| NZC Property Maintenance Ltd | Households | 2025 |
| O T Morrison Properties Ltd | Real estate | 2024 |
| O'Neill Training Consultancy Ltd | Professional & scientific | 2016 |
| Oak Gate Properties Ltd | Real estate | 2024 |
| Oak Leisure Limited | Real estate | 1991 |
| Oakes Develop Ltd | Real estate | 2026 |
| Obrut Machine Tools Limited | Administrative & support | 2010 |
| Obsidian Health Limited | Information & communication | 2014 |
| Occasional Tax Services Limited | Professional & scientific | 2002 |
| Off-Road Agri Limited | Manufacturing | 2021 |
| Offtree Limited | Wholesale & retail | 1991 |
| Ogilvie Risk Consultancy Ltd | Information & communication | 2013 |
| Ohco Limited | Professional & scientific | 1998 |
| Old Bank Works Management Company Limited | Households | 2015 |
| Old Bengal Holmfirth Ltd | Hospitality | 2025 |
| Old Goat Developments Ltd | Construction | 2004 |
| Old Moll Spring Brewing Company Ltd | Manufacturing | 2018 |
| Old Stone Yard Shelley Ltd | Construction | 2019 |
| Oldfield House Construction Ltd | Construction | 2021 |
| Oldham Access Services Limited | Construction | 2012 |
| Oliver Jude Construction Ltd | Construction | 2019 |
| Oliver Live Well Limited | Health & social care | 2024 |
| ON Vector Ltd | Information & communication | 2023 |
| Onboard PR Ltd | Professional & scientific | 2019 |
| One Degree West Management Company Limited | Households | 2018 |
| One Network Solutions Ltd | Information & communication | 2024 |
| Onus Virtual Assistant Ltd | Administrative & support | 2020 |
| OP Framing Limited | Wholesale & retail | 2020 |